Taking advantages of the exeptional reflectivity obtained after electrochemical micromachining, appealing decorations can be engraved on mettalic surfaces. A complex dithering process allows for the creation of a reflectively optically variable image which apparence changes upon rotation or tilt relative to a fixed light source.
In the above displayed video sequence, a microstructured steel coin (diam.30mm, engraving depth 25µm) is rotated in front of a fixed lateral illumination (corresponding to a standard window at a distance of 2 meters).
Observe the light and shadow play on this surface.
More example of such features can be found in the decoration video library.